<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
    <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
    <!-- 生产环境中不建议使用 -->
    <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
    <title>数字时钟</title>
    <style>

    </style>
</head>

<body>
    <div id="app"></div>

</body>
<script type="text/babel">
    class Clock extends React.Component{
        constructor(){
            super()
            this.state = {
                time: new Date()
            }

            setInterval(() => {
                this.setState({
                    time: new Date()
                })
            },1000);
        }


        render(){
            return (<div>
                        <h2>{this.state.time.toLocaleDateString()} {this.state.time.toLocaleTimeString()}</h2>
                    </div>)
        }
    }



    ReactDOM.render(<Clock />,app)
</script>

</html>